Rscript: registered empty quotation

quotation always evals to [0]
Rscript: set up minimal menhir parser with oasis (and an example)
Rscript: started writing the R grammar
Rscript: introduced an AST type
Rscript: ids and assignments in grammar
Rscript: grammar simplification using menhir's awesome inlining
Rscript: function call
Rscript: AST unparsing
Rscript: wrapper code to call the R interpreter (yehaa !)

regression: I don't know how to compile the example prior to
installing the package with findlib ...
A failed attempt to implement antiquotations: doesn't compile
Rscript: compiling with Camlp4 AST types is ok

workaround ocamlbuild bug using mlypack
Rscript: first working antiquotations

- limited to integers and R values
Rscript: A slightly more convincing example
rscript syntax: support for value-path identifiers
rscript syntax: fixed buggy free variables computation
p.adjust and more expressive language in rscript quotations

notably added frequent arithmetic operations
Merge remote-tracking branch 'origin/rscript'

Conflicts:
	_tags